Jet noise control using the dielectric barrier discharge plasma actuators

Abstract

We study experimentally how plasma actuators operating on the basis of surface barrier high fre quency discharge affect jet noise characteristics. The results of investigations of air jets (100-200 m/s) have demonstrated that the studied plasma actuators have control authority over the noise characteristics of these jets. An actuator's effect on the jet in the applied configuration is related to acoustic discharge excitation and to a large extent is similar to the well known Vlasov-Ginevsky effect. It has been shown that jet excitation in the case of St ~ 0.5 using the barrier discharge plasma actuator leads to broadband amplification of jet sound radiation. The jet excitation in the case of St > 2 leads to broadband noise reduction if the action is sufficiently intensive.

Identifying turbulent jet sound sources

“…Therefore, we obtain the representation of the spectral noise intensity function as a result of turbulence-tur bulence type interactions in the following form: (16) where λ is the proportionality coefficient. We also note the similar form of the expression-determined based on elaboration of the acoustic analogy theory with 2 1…”

“…So, according to recent civil aviation proposals, there has been a proposal to decrease the level of the perceived noise of passenger aircraft by 20-25 dB in the vicinity of airports within the next 15-20 years. Timely action in reducing air craft noise includes scientific research and experimen tal design works directed, in particular, at reducing the jet noise levels of turbojet engines and determining the intensity of aircraft acoustic emission in modes corre sponding to increased power unit propulsion and the takeoff and climbing conditions of an aircraft above the Earth's surface near an airport [2][3][4].…”

Концевые Эффекты При Обтекании Плазменного Актуатора

“…Одним из наиболее перспективных приложений является управление с помощью плазменных актуаторов возмущениями и волнами в пограничных и сдвиговых слоях [1][2][3]. Такие исследования проводились для управления двумерными и трехмерными пограничными слоями для различных типов возмущений [4,5], а также для управления аэроакустическими характеристиками сдвиговых слоев в соплах и кавернах [3,[6][7][8]. Ис-пользование актуатора в качестве источника начальных возмущений в пограничном слое зачастую требует точной информации о геометрии воздействия, в том числе в окрестности боковых кромок электродов.…”

Instability wave control in turbulent jet by acoustical and plasma actuators

“…The ¦rst actuator uses the classical two-electrode surface DBD scheme [14]. For its operation, a high-voltage, HF power supply was used, which has the frequency range up to 300 kHz.…”